Bis(1-methyl-1 H-tetra­zol-5-yl)diazene and two its copper(I) chloride complexes poly[[[μ-1,2-bis­(1-methyl-1 H-tetra­zol-5-yl)diazene-κ4 N′, N4: N, N4′]dicopper(I)]-di-μ-chloro] and catena-poly[[chloro­copper(I)]-μ-1,2-bis­(1-methyl-1 H-tetra­zol-5-yl)diazene-κ4 N′, N4: N, N4′]

While bis(1-methyl-1 H-tetra­zol-5-yl)diazene, C4H6N10, (I), has no crystallographically imposed symmetry, in the two title chloro­copper(I) complexes, [Cu2Cl2(C4H6N10)] n, (II), and [CuCl(C4H6N10)] n, (III), the organic ligands lie across centres of inversion; in (III), the Cu and Cl atoms additionally lie about a twofold rotation axis in the space group P2/ c. Complex (II) forms a two-dimensional coordination polymer containing tetra­hedrally coordinated CuI atoms, and complex (III) forms a one-dimensional coordination polymer containing five-coordinate square-pyramidal CuI atoms. [ABSTRACT FROM AUTHOR]